Printing mechanism



Jan. 14,1964 Q P. BARTHELMES I 3,117,515

PRINTING MECHANISM FiledJan, 9, 1962 v 3 Sheets-Sheet 1 1964 o. P.BARTHELMES ,515.

PRINTING MECHANISM Filed Jan; 9, 1962 s Sheets-Sheet 2 Jan. 14, 1964 o.P. BARTHELMES PRINTING MECHANISM 3 Sheets-Sheet 3 Filed Jan. 9, 1962United States Patent Ofiice Ii,ll?,5l Patented Jan. 14, 1964 3,117,515PHQTING MEQHANISM @tto Paul Barthelrnes, Erkrath-Unterbach, nearDusseldost, Germany, assignor to Math. Bauerle G.m.h.H., St. Georgen,Black Forest, Germany, a corporation of Germany Filed Jan. 9, 1962, Ser.No. 165,136 Claims priority, application Germany Jan. 12, 1961 19Claims. (Cl. 101-93) My invention relates to printing mechanisms forbusiness machines, computers, teleprinters and similu equipment.

In printing mechanisms as employed in computers, accounting machines,cash registers and in printing apparatus for remotely controlledrecording of information previously entered from a keyboard into punchtape or other recording media, it is known to provide separatelyadjustable type-face carriers for different kinds of print (normalprint, italics), symbols and legends, and to provide separate typeadjusting devices for the respective typelface carriers. As a rule, thenumber of numeral-denoting type carriers corresponds to the maximumnumber of digit positions to be placed into an accounting column, andspecial type carriers are additionally provided for symbols, letters andlegends. If the printin mechanism serves to place numerical values notonly onto an original form sheet but also onto one or more carboncopies, it is necessary to also provide for distinction between plus andminus values on the copies. When numerals are printed only on anoriginal, a differentiation between plus and minus values is simplyafiorded by printing the former in black and the latter in red, such asby switching between correspondingly colored zones of an inking ribbon.For also obtaining a distinction on copies, it has been proposed toprint plus values in normal print and minus values in italics. In aprinting mechanism with a separate type carrier for each digit positionto be printed, however, this requires doubling the number of typecarriers for the numerals, or arranging normal print and italic-printnumerals on a common type carrier. Both kinds of design result in acomplicated mechanism excessively susceptible to trouble.

in most cases, all type carriers of a printing mechanism have a devicein common by means of which they are moved against the platen roller andthe print-receiving paper after the type carriers have terminated theirat.-

According to one prior proposal, each type carrier, aside from anadjusting device for typeface selection, is additionally provided with aprinting- Lanrmer device. The hammer devices can be so driven that thetype carriers previously selected for operation are moved individuallyand successively into printing position against the pl ten roller in asequence from higher to lower decimal digit positions. This kind of pri.ting mechanism, too, reques a relatively complicated and expensivedesign.

Another disadvantage, common to all known printing mechanisms, is thefact that the so-called stationary formsheet technique is applicableonly for coluzrm printing but not for line printing of several numericalvalues in sequential order. That is, these mechanisms lend themselvesfor line printing only in conjunction with a travelling platen-rollercarriage of complicated design.

it is an object of my invention to devise a printing mechanism, equippedwith type wheels or type rods, which possesses a simple design and isapplicable in form of a column printing device as well as a lineprinting device in conjunction with the so-called stationary formsheettechnique. Another, related, object is to afford the printing ofnumerals and texts in the direction toward hi decimal positions withoutthe necessity of providing the mechanism with as many printing harnrnersas the number of type carriers used.

According to my invention, a printing mechanism is provided with asingle adjusting member for a plurality of type carriers, such as typewheels or type rods, and is adapted to be selectively coupled with aselected one of these type carriers, and the adjusting member is movableinto dide-ren-t control positions by means of a cam with the aid of aplurality, individually actuable control members, so that in each of theselected control positions of the adjusting member a different type faceor" the type carrier, coupled with the adjusting member, is set forprinting operation.

Such a type printing mechanism according to the invention has theadvantage that the number of type carriers required for a particularpurpose can be kept small with relation to the maximum of positions tobe printed. This is because the selection of the type face to be printedat a time is efiected in a simple manner by means of the adjustingmember and by means of a hammer device placed into active relation tothe one type carrier selected.

The printing-hammer device, according to another feature of theinvention, is placed into active connection with one of the respectivetype carriers of the printing mechanism either in dependence upon theparticular mode of functioning to which the computer or other devicethat actuates the printing mechanism is set at a time, or in response toa pre-set control program. Simultaneously with the engagement of thehammer device with this selected type carrier, the coupling connectionbetween the adjusting member and the type carrier is established,whereby during the subsequent motion of the adjusting member independence upon the travel direction and the coasting travel of theadjusting member, a definite type face of this particular type carrieris placed into active printing position. The release of the hammerdevice for the printing of the adjusted type face is effectedconstrainedly through the control members that actuate the adjustingmember, immediately after the adjusting member has selected a type faceof the carrier.

According to a further feature of the invention, the type carriers, orthe swing members which hold the type wheels or type rods, arepreferably arranged in a guiding frame designed as a slide which isincrementally displaceable in analogy to the stepwise displacement ofthe platen-roller carriage in a conventional typewriter. Arranged withinthe slider is another stepping-switch device by means of which theprinting-hammer device is displaceable into active position in front Olfone of the respective type carriers and by means of which the adjustingmember is simultaneously to be coupled with the same type carrier. Thestepping switch device, which controls the relative position of theprinting-hammer device to the type carriers as well as the couplingbetween the type carriers and the adjusting member, is preferablyreleased by a tabulatin-g device or by a control bridge equipped withcontrol riders, so that the release is dependent upon the position ofcolumns and/ or decades.

The above-mentioned and other objects, advantages and features of myinvention will be apparent from and will be described in detail in, thefollowing with reference to the embodiment of a type printing mechanismaccording to the invention illustrated by way of example on theaccompanying drawings in which:

FIG. 1 is a schematic perspective view of a type-wheel printer, theillustration representing substantially only the components essential tothe invention.

FIG. 2 is a partially sectional plan view of the printing mechanismaccording to FIG. 1; and

FIG. 3 is a partly sectional lateral view of the same printingmechanism.

The illustrated printing mechanism is primarily controlled by a group ofracks 1 which constitute the valuedenoting computer members of anotherwise not illustrated calculating machine. The number of the racks 1employed corresponds to the maximal digit-position capacity (number ofdecades) of the calculating machine. That is, the calculating machineemployed in the illustrated case comprises a total of sixteen racks 1and consequently has a capacity of sixteen digit positions. The racks 1are shifted and adjusted in their longitudinal direction to positionscorresponding to the values being transmitted and to be printed by theprinting mechanism. This shifting motion of the racks 1 is effected independence upon the entering of values into the calculating machine oras a consequence of a calculating performance in the calculatingmachine. Thus the totality of rack positions set at a time depends uponthe particular numerical multi-digit amount to be printed. Each of theracks 1 carries a nose 2 from which the value adjustment of the rack 1can be transferred into a transfer carriage 3.

The carriage 3 is equipped with a large number of individual, movabletransfer pieces 4 of which each is displaceably guided in the carriage 3at the intersections of a net of coordinates for displacement parallelto the longitudinal axis of the transfer piece. Accordingly, thetransfer carriage 3 comprises rows of transfer pieces in two mutuallyperpendicular directions. In each of the transfer-piece rows extendingparallel to the displacing motion of the racks 1, a transfer piece 4 isprovided for each digit value (9) Furthermore, each of thesetransfer-piece rows may possess several, for example three, specialtransfer pieces or pins 4a that do not denote numerical values but areassigned to certain control functions. The transfer pins 4a are notadjusted by the noses 2 of the calculator racks 1 but by separateadjusting means. A number of the transfer pieces in the rows extendingtransverse to the displacing direction of the racks 1 correspondsexactly to the number of the racks 1 provided in the calculatingmachine. Consequently the transfer carriage 3 can be charged by each ofthe racks 1 with a value corresponding to the numbers 0-9.

For charging numerical values from the racks 1 into the transfercarriage 3, the carriage 3 is pressed from the printing position A shownin FIG. 2 in the downward direction against the noses 2 of the racks 1.This causes those transfer pieces 4 that register with respective noses2 of the racks 1 to be pressed from below in the upward direction intothe transfer carriage 3. The transfer pieces are kept under springpressure in known manner, and each transfer piece is provided with anose or shoulder which, in the inwardly pressed position of the transferpiece 4, catches behind a latch bar 5, thus locking the latch piece inopposition to the return force of the spring. Each transfer-piece rowextending parallel to the displacing direction of the racks 1, iscorrelated to a separate latch bar 5, and the latch bars 5 are guidedfor movement independently of each other.

From the base position A (FIG. 2.) the transfer carriage 3 can beshifted at a predetermined speed in the direction of the arrow x. Thenthe extensions 5a (FIGS. 1 and 3) of the latch bars 5 glide through thelateral walls of the carriage 3 in slots 6- of stationary guidestructures. The guide slots 6 have an extension 612 which is upwardlydirected and tapers in wedge fashion, the exten sions 6a being locatedapproximately above the calculator rack 1 that denotes the highest digitposition. A pawl protrudes from below into the widened slot portion 6a.One lateral surface of the pawl 7 is substantially parallel to theopposite lateral surface of the wedge-shaped recess 6a. The otherlateral surface of the pawl 7 extends approximately in the symmetry axisof the Wedgeshaped recesses 6a and perpendicularly to the lateralsurfaces of the guide slots 6. The pawl 7 is pivotally mounted and isbraced in opposition to the travel motion of the transfer carriage inthe direction of the arrow at. During a driving motion of the carriage 3in the direction x, therefore, the extended guide portions 5a of thelatch bars 5 run against the sloping surfaces of the pawls 7. Thiscauses the latch bars 5 to be displaced upwardly along guide slots 8 inthe lateral walls of the carriage 3, as the carriage travels in thex-direction.

Only those transfer pieces 4 or 4:1 participate in the displacement ofthe latch bars 5 along slots 8 (FIG. 3) whose noses have caught behindthe latch bar 5 and thus can overcome the force of their respectivebiasing springs. It is apparent that the latch bars 5, extendingtransversely of the travel direction of the transfer carriage (FIG. 2),run successively in the direction toward lower decimal positions againstthe sloping surfaces of the pawls 7 so that the transfer members 4 or 4aare successively placed into active position in the sense of descendingdecimal digits. The design of the latch bars 5 and their extended guidepieces 5a is such that the latch bars to be successively lifted will runagainst the sloping surfaces of the pawls 7 only at the moment at whichthe previously actuated latch bar has glided off the pawl 7.

Suspended above the transfer carriage are several levers 1t) and 16a forpivotal motion about a shaft 9. The levers 10 extend parallel to thetravel direction x of the transfer carriage 3 and are arranged besideeach other so that one of the respective levers 10, 10a is located aboveeach transfer-piece row extending parallel to the travel direction ofthe transfer carriage 3.

The three ends of the levers 1t cooperate with a single adjusting member11 which is guided for displacing motion parallel to the pivot shaft 9of the levers 1t Illa. Two compensating levers 12 coupled with eachother by a pull spring 13, engage the control member 11 at opposite endsand arrest it in a midposition (PEG. 3). For mow ing the control member11 out of its midposition, this member is provided with a pusher cam 14against which the levers 10, 10a are deflected by means of the pawl 7due to lifting of the transfer pieces 4, 4a. In the illustratedembodiment the cam 14 has gable-shaped configuration, and the peak pointof the cam curve accurately bisects the distance between the two outerlevers 10 or Ella. A notch 15 at the peak of cam 14 is engageable by thedeflected lever 10 or Illa in the displaced position of the controlmember 11, for the purpose of retaining the control member 11 in thisposition. It is apparent that the control member 11 can be displacedfrom its midposition either to the right or to the left, and that theparticular displacement distance of the control member 11 corresponds tothe spacing between the deflected lever 10 or 10a and the notch 15 ofcam 14 in the arrested position of the control member 11. Consequently,each. lever 19 or llia produces a different lateral displacement of thecontrol member 11, the direction and length of displacement beingpredetermined.

The control member 11 is provided with rack teeth 16 continuouslymeshing with a pinion 17 journalled for free rotation on the machinehousing. The pinion 17 continuously meshes with a pinion 18 keyed onto asquared entrainer shaft 19 passing transversely through the machinehousing. Another pinion 20 (FIGS. 2 and 3) is seated on the entrainershaft 19 and is displaceable along its entire length. Pinions 1? and 26have the same dimensions. A fork member 21 straddles the hub of pinion-20 and engages a peripheral groove of the hub. The: fork member 21 isdisplaceable along a shaft 22 extending, through the machine housing.

Displaceably guided on and along the shaft 22 and. along another shaft23 within the machine housing is a. frame 24 between whose lateral partsa shaft 25 is. mounted. Several swing members, for example five swing:members, 26a to 262 are journalled on shaft 25 and are individuallyrotatable. Each of the swing members has two arms 26' and 26". Rotatablymounted on the upper arm 2-6 of each swing members 26a to 26:: is a typewheel 27a to 272. Each of the type wheels 27a to 27c is rovided with amultiplicity of, for example 13, type faces uniformly distributed overthe periphery. Respective pin ons 23a to 28c are provided on each of thetype wheels 1270 to 270 and are in continuous meshing engagement withrespective pinions 29a to 2% which are journalled in the respectiveswing members 26a to 26c. The pinion 2b can be placed into meshingengagement with each of the pinions 29a to 29s by laterally displacingthe fork member 21 between the lateral parts of the frame 24 on theshaft 22. This permits ad usting each of the type wheels 27a to Tieindividually, in dependance upon the position of the calculator rack 1,through the action of the transfer carriage 3, the levers lb and Ida,the control member 11, and the pinions 17, fit and 2b.

The printing of the adjusted type face upon the form sheet guided bymeans of a platen roller St is effected by a printing hammer 31 which isguided on shaft 22 for lateral displacement by means of the fork member21 together with the pinion 20. When the pinion Zll is placed intodriving engagement with any one of the type wheels 27a to 272, theprinting hammer 31 is placed simultaneously in front of the lower arm26" of the swing member carrying this particular type wheel. Theprinting hammer 31 is driven by an entrainer shaft 32, preferably ashaft of square cross section, which protrudes through a driving finger53 into the moving range of a teeter 34. The teeter 34 is turned againstthe driving finger 33 by the one lever it? or Illa that also effects theadjustment of the one type wheel. The turning motion is forced upon theteeter 34- by the lever 19 or 19a at the moment in which the lever It)or commences entering into the notch 25 of the control member 11 forlatching the latter. As is apparent from FIG. 3, the active connectionbetween the pinion it) and the particular type wheel adjusted thereby ata time, is eliminated when the adjusted typeface is bein' imprinted. inorder to prevent the type wheel from becoming displaced during theprinting motion, suitable locking members (not illustrated) of 'now kindare provided wt rch latch the type wheels in their po on relative to theswing member as soon as the pinion moves out of meshing en agement.

The frame 24-, conjointly with the type wheels 27a to 27c journaled bymeans of the swing members 26a to c in the frame, and also together withthe adjusting and printing devices 2! and 31 guided by the fork member21, forms a slider assembly which is incrementally movable along theplaten roller 3% by cans of the shafts 22 and 23. This slider assemblycomprises a type wheel 27:: with number type faces in normal print forproducpositive number sequences, as well as a type wheel 27!) withinclined types or italics denoting numbers to be printed as negativevalues. Each of these type wheels 27a and 27b is further provided withtype faces for function-denoting le ends such as item (or single item)sub-total and total. The three other type Wheels 276 to 2% serve for theprinting of further characters and legends.

As explained, the transfer carriage, durin its progressive linear travelin the direction of the arrow x (PEG. 2) causes the transfer pieces 4,adjusted by means of the racks i, as well as the transfer pieces 4a.,adjusted by special control members, to become active against the leversit in the direction toward lower decimal digit positions. Consequently,the printing of the adjusted type faces also takes place in thedirection toward lower decimal dig' s. l or this purpose, the printingslider assembly is equipped with a stepping-switch device ofconventional design or with a switching lock (not illustrated). Thislock is actuated in dependence upon the movement of the printing hat mer31 so that the slider assembly performs one switching step after eachtype printing operation. As a rule, the fork member which holds theadjusting pinion 23 and the printing hammer 31, participates in thestepping-switch motion of the slider assembly, so that the pinion 2t andthe printing hammer 31, during a succession of several type-printingoperations, remain correlated to one and the same printer swing member26a to Zoe. However, if the pinion 2i} and the hammer 31, after theprinting operation of the given type group is terminated, are to beswitched over to a type group provided on any other desired type wheelin order to then commence printing different type faces, it is necessaryto ad- Vance the fork member 21 relative to the printing slider. lftypes in italics are to be printed after the printing of normal types,it is necessary to suppress the stepping travel of the printing slider,and, in lieu thereof, to only perform a forward switching of the forkmember 21. As a result, the pinion Zll and the printing hammer 31 becomedisengaged from the swing member 26a of the normaltype wheel 27a, andnow enter into the range of the swing member 26b for the italics-typewheel 2.7!). On the other hand, if it is necessary to keep a type wheelavailable for the printing of symbols or legends, then the fork member21 must be kept arrested, while the slider assembly alone performs acorresponding stepping-switch travel. Therefore, another stepping switchmechanism can be provided between printing slider and fork member 21, tobe actuated, for example in dependence upon a given program or by remotecontrol in known manner.

Such a printing mechanism is particularly well suitable for use inaccounting machines according to the so-called stationary form-sheettechnique. It is applicable for column printing as well as for theline-printing method customary with accounting machines having atravelling pa per carriage. This is because the control of the printingslider can be performed in dependence upon a pre-set or pro-selectedprogram. By applying a control program for column printing it is thuspossible to switch the printing slider assembly back to its startingposition after printing a given type sequence or a given number oftypes, and to simultaneously release a line switching of the platenroller. The control program can be made interchangeable or selectivelyadjustable in known manner so that a program for line printing canlikewise be readily utilized. With a line-printing control program, theprinting slider assembly is switched forward a selectable number ofswitching steps after printing a predetermined type sequence or numberof types. Only when the last-programmed type is imprinted upon therecording form sheet, is the printing slider assembly returned to itsstarting position and simultaneously a line switching performed. Whenoperating with column printing, the return of the transfer carriage toits base position A (FIG. 2) is released simultaneously with the returnof the printing slider assembly. When operating with line printing, thereturn of the transfer carriage into this base position takes place independence upon the forward switching of the slider assembly to the nextprinting column of the same line. However, it is also readily possibleto employ a transfer carriage whose capacity corresponds to the maximumcapacity of an accounting line on the accounting form being used. Then,when operating with line printing, a return of the transfer carriage toits base position is possible only after completion of a line-printmgsequence.

According to FIG. 3, the transfer carriage 3 cooperates with Contactsliders or brushes 35 by means of which it is possible to releasecontrol commands for imprinting of type faces accurately into thecolumns, and, inside the columns, in the accurate decades. With the aidof this device, the printing mechanism can be controlled to skip theprinting of zeros at the left of the first vacant digit during correctdecade-wise printing in each accounting column. To provide for thecontrol commands required in the individual columns, a positionindication is controlled in dependence upon the fork member 21.Furthermore, in dependence upon the position of mem ber 21 in the sliderassembly, in conjunction with the contact 36 actuated by the levers 10,the issuance of the types to be imprinted, for example for tape or cardpunches, can be remotely controlled.

Although the invention is described with reference to the printingmechanism with type-wheels, it is readily applicable with printers whosetype faces are mounted on rod-shaped carriers. It is then only necessaryto employ such type-carrier rods in lieu of the type wheels.

it can also be seen from FIG. 2, that the transfer carriage 3 may bebrought by the calculator racks 1 not only to the base position A butalso to a second base position B in which the transfer-piece rowrepresenting the highest digit value is first located above theadjusting. levers 37 of a group 38 of data-entering control magnets. Bymeans of a stepping-switch device (not shown) of known type the transfercarriage 3 can be intermittently switched forward from the base positionB in the direction towards lower decimal digit positions, each timeafter one of the adjusting members 37 of the magnetic data-enteringdevice 38 has substituted 2. transfer piece 4 or 46s. The control of thestepping-switch device is released by a universal bar 39 with which eachof the adjusting members 37 in the magnetic entering device 38cooperates during a switching movement. After the transfer carriage 3 isfilled by the magnetic data entering device 33 and has left the baseposition B, the carriage can be moved ahead, either by switching or bycontinuous displacement at predetermined speed as described above withreference to travel in the direction of the arrow x.

Due to the fact that the pawls 7, cooperating with the guides 6, arepivotally mounted in such a manner that they will turn in opposition tothe direction at when the transfer carriage 3 is in travelling motion,an easy and unimpeded return travel of the transfer carriage 3 issecured.

Upon a study of this disclosure, it will be obvious to those skilled inthe art that my invention permits of various modifications with respectto structural details and airangement of components, Without departingfrom the essential features of my invention, and hence that my inventioncan be embodied in printing mechanisms other than particularlyillustrated and described herein, without departing from the essentialfeatures of my invention and within the scope of the claims annexedhereto.

I claim:

1. A printing mechanism for calculating machines, business machines,teleprinters or the like machinery, comprising type carriersrespectively equipped with different kinds of types, symbols and legendsto be printed, each of said type carriers being movable independently ofthe other carriers for placing a selected one type into printingposition; a single displaceable control member common to a plurality ofsaid type carriers and adapted to be coupled with a selected one of saidcarriers, said control member havin a cam means; a plurality ofindividually actuable selector members engageable with said cam meansfor displacing said control member to respectively different controlpositions depending upon which of said selector members is actuated; ineach of said control positions a different one of the types being inprinting position on the one carrier coupled with said control member.

2. In a printing mechanism according to claim 1, each of said controlpositions of said control member being determined by a different one ofsaid selector members, and said selector members being mounted side byside, and being equally spaced from each other.

3. In a printing mechanism according to claim 2, said and the typecarrier coupled with said control member a .at a time being adjustablefrom a midposition in two mutually opposed directions respectively.

4. In a printing mechanism according to claim 3, said cam contour ofsaid control member having a notch located on the symmetry axis of thecontour, the one selector member actuable for the selection of a givencontrol position of said control member being latchingly engageable withsaid notch when said control member reaches said control position.

5. In a printing mechanism according to claim 4, each of said selectormembers forming a swing arm and having one end pivoted and the other endengageable with said cam contour of said control member, said selectormembers being deflectable about their respective pivots, :a transfercarriage having transfer pieces sequentially displaceable in thedirection toward smaller decimal digits, said swing arms beingindividually defiectable by said transfer pieces when the latter are inlifted position, whereby selected swing arms are moved against said camtcontour during travel of said transfer carriage.

6. A printing mechanism according to claim 5, comprising a cam pawl, andsaid transfer pieces for deflection of said selector members beingliftable by said cam pawl.

7. In a printing mechanism according to claim 6, said transfer carriagebeing selectively lowerable to a base position to be charged from thevalue-denoting members of a calculating or accounting machine, and beingdis placeable in decadic steps from a different base position to bechanged by values from a magnetic data-entering group.

8. A printing mechanism according to claim 2, comprising swing membersin which said type carriers are mounted, a guiding frame in which saidswing members are pivotally mounted beside one another for individualswinging motion, a printing hammer incrementally displaceable togetherwith said guiding frame and engageable with one of said respective swingmembers in dependence upon a control program or by remote control.

9. In a printing mechanism according to claim 8, said guiding frame forthe type-carrier swing members forming a slider assembly and beingincrementally displaceable in dependence upon the actuation of saidprinting hammer.

10. A printing mechanism according to claim 9, comprising anintermediate member incrementally displaceable together with saidprinting hammer in said slider assembly and adjustingly engageable withsaid type carriers, an entrainer shaft having stationary bearings, anddrive means for actuating said printing hammer as well as saidtype-ad-usting intenmediate member, said drive means being connectedwith said ent-rainer shaft to be operated thereby.

References Cited in the tile of this patent UNITED STATES PATENTS2,155,991 Kurowski Apr. 25, 1939 2,192,365 Pitman Mar. 5, 1940 2,812,906Reppert Nov. 12, 1957 2,924,382 Saxby et al. Feb. 9, 1960 2,986,993 GangJune 6, 1961

1. A PRINTING MECHANISM FOR CALCULATING MACHINES, BUSINESS MACHINES,TELEPRINTERS OR THE LIKE MACHINERY, COMPRISING TYPE CARRIERSRESPECTIVELY EQUIPPED WITH DIFFERENT KINDS OF TYPES, SYMBOLS AND LEGENDSTO BE PRINTED, EACH OF SAID TYPE CARRIERS BEING MOVABLE INDEPENDENTLY OFTHE OTHER CARRIERS FOR PLACING A SELECTED ONE TYPE INTO PRINTINGPOSITION; A SINGLE DISPLACEABLE CONTROL MEMBER COMMON TO A PLURALITY OFSAID TYPE CARRIERS AND ADAPTED TO BE COUPLED WITH A SELECTED ONE OF SAIDCARRIERS, SAID CONTROL MEMBER HAVING A CAM MEANS; A PLURALITY OFINDIVIDUALLY ACTUABLE SELECTOR MEMBERS ENGAGEABLE WITH SAID CAM MEANSFOR DISPLACING SAID CONTROL MEMBER TO RESPEC-